JP5316819B2 - Vehicle heating system - Google Patents

Vehicle heating system Download PDF

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Publication number
JP5316819B2
JP5316819B2 JP2010276877A JP2010276877A JP5316819B2 JP 5316819 B2 JP5316819 B2 JP 5316819B2 JP 2010276877 A JP2010276877 A JP 2010276877A JP 2010276877 A JP2010276877 A JP 2010276877A JP 5316819 B2 JP5316819 B2 JP 5316819B2
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cooling water
circulation path
engine
side circulation
heater core
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JP2012126157A (en
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重治 石井
久史 土井
誠 勝木
進作 冨田
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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Priority to JP2010276877A priority Critical patent/JP5316819B2/en
Priority to EP11188051.4A priority patent/EP2463129B1/en
Priority to US13/295,837 priority patent/US9259990B2/en
Priority to CN201110415446.7A priority patent/CN102529638B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/03—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant
    • B60H1/034—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant from the cooling liquid of the propulsion plant and from an electric heating device

Description

本発明は、車両用暖房装置に関し、冷却水の加熱手段を有する車両の暖房装置に関する。   The present invention relates to a vehicle heating device, and more particularly to a vehicle heating device having heating means for cooling water.

ハイブリッド車やアイドルストップ車等の車両の暖房性能を確保するために、ヒータコアに導入する冷却水を加熱する電気ヒータ等の加熱装置を備えている車両用暖房装置が開発されている。
この車両用暖房装置では、エンジンが停止していても暖房が可能なように、エンジンとヒータコアとを循環する冷却水循環路に、加熱装置と電動ポンプとが備えられている。更に、エンジンが冷態状態である場合に暖房性能がすぐに発揮できるように、ヒータコアを循環する冷却水がエンジンに流入しないように冷却水の回路を切換える四方弁を備えているものがある。四方弁は、コントロールユニットによって作動制御され、外気温度や室内温度に応じて切換えられる（特許文献１）。 In order to ensure the heating performance of a vehicle such as a hybrid vehicle or an idle stop vehicle, a vehicle heating device including a heating device such as an electric heater that heats cooling water introduced into a heater core has been developed.
In this vehicle heating device, a heating device and an electric pump are provided in a cooling water circulation path that circulates between the engine and the heater core so that heating can be performed even when the engine is stopped. Furthermore, there are some equipped with a four-way valve that switches the circuit of the cooling water so that the cooling water circulating through the heater core does not flow into the engine so that the heating performance can be immediately exerted when the engine is in a cold state. The four-way valve is operated and controlled by a control unit, and is switched according to the outside air temperature and the room temperature (Patent Document 1).

特開２０００−１０８６４５号公報JP 2000-108645 A

しかしながら、特許文献１に用いられる四方弁は、電磁弁方式あるいはモータ駆動による切換方式のような電動タイプのものとなり、比較的高価なものとなってしまう。また、四方弁を作動制御するために、コントロールユニット及び温度センサが必要とされ、暖房装置全体のコストアップを招いてしまう。また、温度センサで検出した外気温度あるいは室内温度により冷却水の回路を切換える機構であるので、エンジンの温度状態を的確に判断し、暖房制御に反映させることは難しい。例えば、室内温度が低い場合、ヒータコアを循環する冷却水がエンジンに流入しない回路に切換え制御されている。この場合、暖房速効性により室内温度が高まると、ヒータコアを循環する冷却水がエンジン側に循環する回路に切換え制御されることとなるが、この際にエンジン冷態状態であると、エンジンで冷やされた冷却水がヒータコアに循環することにより、暖房性を損なう虞がある。   However, the four-way valve used in Patent Document 1 is an electric type such as a solenoid valve system or a motor-driven switching system, and is relatively expensive. Moreover, in order to control the operation of the four-way valve, a control unit and a temperature sensor are required, leading to an increase in the cost of the entire heating device. In addition, since the cooling water circuit is switched according to the outside air temperature or the room temperature detected by the temperature sensor, it is difficult to accurately determine the temperature state of the engine and reflect it in the heating control. For example, when the room temperature is low, switching control is performed so that the cooling water circulating through the heater core does not flow into the engine. In this case, when the room temperature increases due to the heating rapidity effect, the cooling water circulating through the heater core is controlled to be switched to a circuit that circulates to the engine side. There is a possibility that the heating performance is impaired by the circulating cooling water circulating in the heater core.

本発明は、この様な問題を解決するためになされたもので、その目的とするところは、冷却水回路を切換える四方弁を安価にするとともに暖房装置全体を簡単かつ安価な構成とし、効率の良い暖房制御を行う車両用暖房装置を提供することにある。   The present invention has been made to solve such a problem. The object of the present invention is to reduce the cost of the four-way valve for switching the cooling water circuit and to make the entire heating device simple and inexpensive, thereby improving the efficiency. An object of the present invention is to provide a vehicle heating apparatus that performs good heating control.

上記の目的を達成するために、請求項１の車両用暖房装置は、エンジンとヒータコアとの間で冷却水を循環させる冷却水循環路に、冷却水を加熱する加熱手段と、冷却水循環用のポンプ及び切換バルブを備え、切換バルブにより冷却水の循環を、ヒータコア、ポンプ及び加熱手段の間で冷却水を循環させるヒータコア側循環路と、エンジンに冷却水を循環させるエンジン側循環路とに分割切換可能な車両用暖房装置であって、切換バルブは、エンジン側循環路から流入する冷却水を、当該冷却水の温度に応じて、ヒータコア側循環路とエンジン側循環路とのいずれかに流入させるように流路を切り換えるサーモバルブと、サーモバルブの切換えに拘わらず、ヒータコア側循環路から流入する冷却水をエンジン側循環路へ導入する導入通路と、導入通路から分岐し、ヒータコア側循環路から流入する冷却水をヒータコア側循環路に戻すバイパス路とを有し、サーモバルブは、エンジン側循環路から流入する冷却水を、エンジン側循環路に流入させるように流路を切り換える際に、エンジン側循環路から流入する冷却水がヒータコア側循環路に流入するのを遮断するように構成され、切換バルブは、サーモバルブによりエンジン側循環路から流入する冷却水を、ヒータコア側循環路に流入させるように流路が切り換えられている場合に、エンジン側循環路から流入する冷却水がバイパス路と導入通路を通って、エンジン側循環路に戻されるように構成されていることを特徴とする。 In order to achieve the above object, a vehicle heating apparatus according to claim 1 is a cooling water circulation path for circulating cooling water between an engine and a heater core, heating means for heating the cooling water, and a pump for circulating the cooling water. And a switching valve to divide the cooling water into a heater core side circulation path for circulating the cooling water between the heater core, the pump and the heating means, and an engine side circulation path for circulating the cooling water to the engine. The vehicle heating device is capable of switching the cooling water flowing from the engine-side circulation path to either the heater core-side circulation path or the engine-side circulation path according to the temperature of the cooling water. a thermo valve for switching the flow path so as, irrespective of the switching of the thermo-valve, the introduction passage for introducing the cooling water flowing from the heater core side circulation path to the engine side circulation path, Branched from the entry passage, and a bypass passage for returning the heater core side circulation path of the cooling water flowing from the heater core side circulation path, thermo-valve inflow, the cooling water flowing from the engine side circulation path, the engine-side circulation path When switching the flow path, the cooling water flowing from the engine side circulation path is blocked from flowing into the heater core side circulation path, and the switching valve flows from the engine side circulation path by the thermo valve When the flow path is switched so that the cooling water flows into the heater core side circulation path, the cooling water flowing from the engine side circulation path passes through the bypass path and the introduction path and is returned to the engine side circulation path. It is comprised by these.

請求項１の発明によれば、切換バルブにより冷却水の循環を、ヒータコアとポンプと加熱手段との間で冷却水を循環させるヒータコア側循環路と、エンジンに冷却水を循環させるエンジン側循環路とに分割させ、サーモバルブにより、エンジン側循環路から流入する冷却水の温度に応じて、流路を切り換えることで、冷態始動時のようにエンジン温度が低下している場合に、加熱装置により加熱された冷却水をエンジンを通過させずにバイパス路を通じてヒータコア側循環路に流入させることができる。したがって、冷却水温度を低下させずにヒータコアから熱を取り出して迅速に暖房性能を得ることが可能となる。   According to the invention of claim 1, the cooling water is circulated by the switching valve, the heater core side circulation path for circulating the cooling water between the heater core, the pump and the heating means, and the engine side circulation path for circulating the cooling water to the engine. When the engine temperature is low, such as during cold start, by switching the flow path according to the temperature of the cooling water flowing from the engine side circulation path by the thermo valve The cooling water heated by can be made to flow into the heater core side circulation path through the bypass path without passing through the engine. Accordingly, it is possible to quickly obtain the heating performance by extracting heat from the heater core without lowering the cooling water temperature.

そして、サーモバルブにより冷却水温度に基づく冷却水循環路の切換えが行なわれることから、電磁ソレノイドやモータ等、バルブを切換えるための駆動手段を必要とすることなく、切換バルブを安価な構成にすることができる。また、これに伴い、バルブを切換えるための駆動手段を制御する制御装置や温度を検出するセンサ等を必要とすることなく、暖房装置全体を簡易かつ安価な構成にすることができる。   Then, since the cooling water circulation path is switched based on the cooling water temperature by the thermo valve, the switching valve can be made inexpensively without requiring a driving means for switching the valve such as an electromagnetic solenoid or a motor. Can do. Accordingly, the entire heating device can be made simple and inexpensive without requiring a control device for controlling the driving means for switching the valves, a sensor for detecting the temperature, and the like.

更に、ヒータコア側循環路から切換えバルブに流入する冷却水が、導入通路によって、サーモバルブの切換えに拘わらずエンジン側循環路へ導入されるので、エンジンを通過しないヒータコア側循環路が形成された場合に、このヒータコア側循環路を循環する冷却水が温度上昇して膨脹したとしても、導入通路を通ってエンジン側循環路に導入され、ヒータコア側循環路からの水漏れを防止することができる。 Furthermore , since the coolant flowing into the switching valve from the heater core side circulation path is introduced into the engine side circulation path by the introduction passage regardless of the switching of the thermo valve, the heater core side circulation path that does not pass through the engine is formed. In addition, even if the cooling water circulating through the heater core side circulation path rises due to an increase in temperature, it is introduced into the engine side circulation path through the introduction passage, and water leakage from the heater core side circulation path can be prevented.

また、エンジン側循環路から流入する冷却水を、ヒータコア側循環路に流入させる流路が形成された場合に、ポンプが停止すると、導入通路の冷却水の流圧が弱まり、このエンジン側循環路から流入する冷却水の一部が、分岐配設されたバイパス通路を通じて導入通路に流入し、エンジン側循環路に戻されるようになる。したがって、車両冷房時にポンプを停止した際は、ヒータコア側循環路の冷却水の循環が抑制され、冷却水の熱がヒータコアから排出されることが抑制され、冷房性能の低下を防止することができる。 In addition , when a flow path is formed in which the cooling water flowing from the engine-side circulation path is allowed to flow into the heater core-side circulation path, when the pump stops, the flow pressure of the cooling water in the introduction passage weakens, and this engine-side circulation path A part of the cooling water flowing in from the refrigerant flows into the introduction passage through the branched bypass passage and is returned to the engine-side circulation passage. Therefore, when the pump is stopped during the cooling of the vehicle, the circulation of the cooling water in the heater core side circulation path is suppressed, the heat of the cooling water is suppressed from being discharged from the heater core, and the deterioration of the cooling performance can be prevented. .

本発明の一実施形態に係る車両用暖房装置の概略構成図である。It is a schematic block diagram of the heating apparatus for vehicles which concerns on one Embodiment of this invention. 切換バルブの詳細な構成を示す内部構造図であり、（Ａ）が冷却水の低温時、（Ｂ）が冷却水の高温時での状態を示す。It is an internal structure figure which shows the detailed structure of a switching valve, (A) is the state at the time of low temperature of cooling water, (B) shows the state at the time of high temperature of cooling water. 切換バルブ内の構造を模式的に図示した車両用暖房装置の構成図である。It is a block diagram of the heating apparatus for vehicles which showed typically the structure in a switching valve.

以下、本発明の実施の形態を図面に基づき説明する。
図１は、本発明の一実施形態に係る車両用暖房装置の概略構成図である。
図１に示すように、本実施形態では、エンジン１の冷却水循環路２には、冷却水の流通方向の順番に、電気ヒータ３（加熱手段）、ヒータコア４及び電動ポンプ５が備えられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a vehicle heating apparatus according to an embodiment of the present invention.
As shown in FIG. 1, in the present embodiment, the cooling water circulation path 2 of the engine 1 is provided with an electric heater 3 (heating means), a heater core 4, and an electric pump 5 in order of the flow direction of the cooling water. .

電気ヒータ３は、エンジン１が停止した状態でも作動可能であって、冷却水循環路２内の冷却水を加熱する機能を有する。ヒータコア４は、冷却水の熱エネルギーを取り出して、車両の室内へ供給する空気と熱交換して暖める機能を有する。電動ポンプ５は、冷却水循環路２内の冷却水を循環させる機能を有する。
また、冷却水循環路２には切換バルブ１０が備えられている。切換バルブ１０は、２つの流入口１１、１２と２つの排出口１３、１４とを備え、冷却水循環路２を切換える機能を有する。切換バルブ１０の２つの流入口１１、１２のうち、第１の流入口１１はエンジン１の冷却水出口に接続され、第２の流入口１２は電動ポンプ５の排出口に接続されている。切換バルブ１０の２つの排出口１３、１４のうち、第１の排出口１３は電気ヒータ３の流入口に接続され、第２の排出口１４はエンジン１の冷却水入口に接続されている。 The electric heater 3 can be operated even when the engine 1 is stopped, and has a function of heating the cooling water in the cooling water circulation path 2. The heater core 4 has a function of taking out heat energy of the cooling water and warming it by exchanging heat with air supplied to the vehicle interior. The electric pump 5 has a function of circulating the cooling water in the cooling water circulation path 2.
The cooling water circulation path 2 is provided with a switching valve 10. The switching valve 10 includes two inlets 11 and 12 and two outlets 13 and 14 and has a function of switching the cooling water circulation path 2. Of the two inlets 11 and 12 of the switching valve 10, the first inlet 11 is connected to the coolant outlet of the engine 1, and the second inlet 12 is connected to the outlet of the electric pump 5. Of the two outlets 13 and 14 of the switching valve 10, the first outlet 13 is connected to the inlet of the electric heater 3, and the second outlet 14 is connected to the cooling water inlet of the engine 1.

図２は、切換バルブ１０の詳細な構成を示す内部構造図であり、（Ａ）が冷却水の低温時、（Ｂ）が冷却水の高温時での状態を示す。
切換バルブ１０は、冷却水の温度に応じて開閉するサーモバルブ２０を備えている。図２に示すように、サーモバルブ２０には、内部に略円柱状の空間を有するケース２１と、当該ケース２１内に軸線方向（図中上下方向）に移動可能なシャフト２２を備えている。シャフト２２には、上部に第１の弁体２３と下端に第２の弁体２４が設けられている。ケース２１内の空間は、第１の弁体２３により上部側の空間２５と下部側の空間２６との２つに仕切られるように構成されている。図２（Ａ）に示すように、シャフト２２が上方に移動した状態では第１の弁体２３によって上部側の空間２５と下部側の空間２６とが遮断される。図２（Ｂ）に示すように、シャフト２２が下方に移動した状態では上部側の空間２５と下部側の空間２６とが連通するように構成されている。 FIG. 2 is an internal structure diagram showing a detailed configuration of the switching valve 10, where (A) shows a state at a low temperature of the cooling water and (B) shows a state at a high temperature of the cooling water.
The switching valve 10 includes a thermo valve 20 that opens and closes according to the temperature of the cooling water. As shown in FIG. 2, the thermo valve 20 includes a case 21 having a substantially cylindrical space inside, and a shaft 22 that can move in the axial direction (vertical direction in the drawing) in the case 21. The shaft 22 is provided with a first valve body 23 at the top and a second valve body 24 at the bottom. The space in the case 21 is configured to be divided into two parts, that is, an upper space 25 and a lower space 26 by the first valve body 23. As shown in FIG. 2A, the upper space 25 and the lower space 26 are blocked by the first valve body 23 when the shaft 22 moves upward. As shown in FIG. 2B, the upper space 25 and the lower space 26 communicate with each other when the shaft 22 moves downward.

ケース２１の周壁には下部側の空間２６と連通する第１の流入口１１が設けられているとともに、ケース２１の上部には上部側の空間２５と連通する第１の排出口１３が設けられている。また、ケース２１の下部には、第２の排出口１４と連通する弁口２７が設けられている。弁口２７は、第２の弁体２４により開閉される。
シャフト２２は、図示しない感温体が内蔵され、下部側の空間２６に貯留する冷却水の温度に応じて軸線方向に移動し、低温時には図中上方に、高温時には図中下方に移動する。 A first inflow port 11 communicating with the lower space 26 is provided on the peripheral wall of the case 21, and a first discharge port 13 communicating with the upper space 25 is provided at the upper portion of the case 21. ing. In addition, a valve port 27 communicating with the second discharge port 14 is provided at the lower portion of the case 21. The valve port 27 is opened and closed by the second valve body 24.
The shaft 22 incorporates a temperature sensing element (not shown), moves in the axial direction according to the temperature of the cooling water stored in the lower space 26, and moves upward in the figure at a low temperature and downward in the figure at a high temperature.

更に、切換バルブ１０には、第２の流入口１２と第２の排出口１４とを連通する導入通路２８が設けられている。また、切換バルブ１０には、第２の流入口１２と上部側の空間と２５を連通するバイパス路２９が設けられている。
図２（Ａ）に示すように、冷却水の温度が低下してシャフト２２が図中上方に移動すると、第２の弁体２４が弁口２７から離間して弁口２７が開放されて第１の流入口１１と第２の排出口１４とが連通するとともに、第１の弁体２３によってケース２１内の上部側の空間２５と下部側の空間２６とが遮断されて第１の流入口１１と第１の排出口１３とが遮断される。 Furthermore, the switching valve 10 is provided with an introduction passage 28 that allows the second inlet 12 and the second outlet 14 to communicate with each other. Further, the switching valve 10 is provided with a bypass passage 29 that communicates the second inlet 12 and the upper space 25 with each other.
As shown in FIG. 2 (A), when the temperature of the cooling water decreases and the shaft 22 moves upward in the figure, the second valve body 24 is separated from the valve port 27 and the valve port 27 is opened, and the second valve body 24 is opened. The first inlet 11 and the second outlet 14 communicate with each other, and the first valve body 23 blocks the upper space 25 and the lower space 26 in the case 21 so that the first inlet 11 and the 1st discharge port 13 are interrupted | blocked.

図２（Ｂ）に示すように、冷却水の温度が上昇してシャフト２２が図中下方に移動すると、第２の弁体２４により弁口２７が遮断されるとともに、第１の弁体２３は開放してケース２１内の上部側の空間２５と下部側の空間２６とが連通し第１の流入口１１と第１の排出口１３とが連通する。
図３は、切換バルブ１０内の構造を模式的に図示した車両用暖房装置の構成図である。 As shown in FIG. 2 (B), when the temperature of the cooling water rises and the shaft 22 moves downward in the drawing, the valve port 27 is blocked by the second valve body 24 and the first valve body 23. Is opened, the upper space 25 and the lower space 26 in the case 21 communicate with each other, and the first inlet 11 and the first outlet 13 communicate with each other.
FIG. 3 is a configuration diagram of the vehicle heating apparatus schematically showing the structure inside the switching valve 10.

上記のように、切換バルブ１０を構成することで、本実施形態では、エンジン１から第１の流入口１１に流入した冷却水が、サーモバルブ２０によって、第１の排出口１３側、即ち電気ヒータ３への流入と、第２の排出口１４側、即ちエンジン１への戻りとで切換えられる。
また、第２の流入口１２から流入した冷却水は、導入通路２８を通過して第２の排出口１４から排出され、エンジン１の冷却水入り口に戻されるように構成されている。 As described above, by configuring the switching valve 10, in the present embodiment, the cooling water flowing into the first inlet 11 from the engine 1 is transferred to the first outlet 13 side by the thermovalve 20, that is, electric Switching is made between the flow into the heater 3 and the return to the second exhaust port 14 side, that is, the engine 1.
Further, the cooling water flowing in from the second inlet 12 passes through the introduction passage 28 and is discharged from the second outlet 14, and is returned to the cooling water inlet of the engine 1.

更に、バイパス路２９によって、第２の流入口１２と第１の排出口１３とが連通しているので、第１の流入口１１と第１の排出口１３とが遮断されていても、第２の流入口１２から流入した冷却水がバイパス路２９を通過して第１の排出口１３へ供給可能となっている。
したがって、エンジン１からの冷却水が低温状態である場合には、サーモバルブ２０によりエンジン１からの冷却水がヒータコア４を通過せずにエンジン１に戻される循環路３０（エンジン側循環路）が形成されるとともに、電気ヒータ３、ヒータコア４、電動ポンプ５を備えた、エンジン１を通過しない冷却水の循環路３１（ヒータコア側循環路）が形成される。よって、始動直後のようにエンジン１からの冷却水の温度が低下している場合には、電気ヒータ３により加熱された冷却水がエンジン１を通過せず、温度低下が抑えられてヒータコア４に導入されることになり、ヒータコア４から熱を取り出して迅速に温度上昇させることが可能となる。 Further, since the second inlet 12 and the first outlet 13 are communicated with each other by the bypass passage 29, the first inlet 11 and the first outlet 13 are blocked even if the first inlet 11 and the first outlet 13 are blocked. The cooling water flowing in from the two inlets 12 can pass through the bypass passage 29 and be supplied to the first outlet 13.
Therefore, when the cooling water from the engine 1 is in a low temperature state, the circulation path 30 (engine-side circulation path) through which the cooling water from the engine 1 is returned to the engine 1 without passing through the heater core 4 by the thermo valve 20 is provided. A cooling water circulation path 31 (heater core side circulation path) that does not pass through the engine 1 and that includes the electric heater 3, the heater core 4, and the electric pump 5 is formed. Therefore, when the temperature of the cooling water from the engine 1 is decreasing just after starting, the cooling water heated by the electric heater 3 does not pass through the engine 1, and the temperature decrease is suppressed and the heater core 4 is suppressed. As a result, heat can be taken out from the heater core 4 and the temperature can be quickly raised.

エンジン１からの冷却水が高温状態である場合には、サーモバルブ２０によりエンジン１からの冷却水がヒータコア４側に流入するので、エンジン１から排出された冷却水の熱をヒータコア４から取り出すことが可能となり、エンジン１の熱を利用した暖房効果を得ることができる。
そして、冷却水温度に基づく冷却水循環路２の切換えは、サーモバルブ２０によって行なわれるので、電磁ソレノイドやモータ等、バルブを切換えるための駆動手段を必要とすることなく、切換バルブ１０を安価な構成にすることができる。また、これに伴い、バルブを切換えるための駆動手段を制御する制御装置や温度を検出するセンサ等を必要とすることなく、暖房装置全体を簡易かつ安価な構成にすることができる。 When the cooling water from the engine 1 is in a high temperature state, the cooling water from the engine 1 flows into the heater core 4 side by the thermo valve 20, so that the heat of the cooling water discharged from the engine 1 is taken out from the heater core 4. The heating effect using the heat of the engine 1 can be obtained.
Since the switching of the cooling water circulation path 2 based on the cooling water temperature is performed by the thermo valve 20, the switching valve 10 can be constructed at low cost without requiring a driving means for switching the valve such as an electromagnetic solenoid or a motor. Can be. Accordingly, the entire heating device can be made simple and inexpensive without requiring a control device for controlling the driving means for switching the valves, a sensor for detecting the temperature, and the like.

また、ヒータコア４を通過し第２の流入口１２に流入した冷却水が、導入通路２８を通過して第２の排出口１４に排出され、サーモバルブ２０の切換えに拘わらずエンジン側へ導入される。よって、サーモバルブ２０のシャフト２２が上方に移動してエンジン１を通過しない冷却水の循環路３１が形成された場合に、この循環路３１を循環する冷却水の温度が電気ヒータ３による加熱等により上昇して膨脹したとしても、導入通路２８を通ってエンジン１側に導入されることで、循環路３１からの水漏れを防止することができる。   The cooling water that has passed through the heater core 4 and has flowed into the second inlet 12 passes through the introduction passage 28 and is discharged to the second outlet 14, and is introduced to the engine side regardless of the switching of the thermovalve 20. The Therefore, when the cooling water circulation path 31 that does not pass through the engine 1 is formed by moving the shaft 22 of the thermo valve 20 upward, the temperature of the cooling water circulating through the circulation path 31 is heated by the electric heater 3 or the like. Even if it rises and expands due to this, it is possible to prevent water leakage from the circulation path 31 by being introduced to the engine 1 through the introduction passage 28.

また、本実施形態では、車両暖房時に電動ポンプ５を作動させるとともに、車両冷房時に電動ポンプ５を停止するようにしている。
本実施形態では、バイパス通路２９によって、第１の排出口１３と第２の流入口１２とが常時連通しているので、冷却水温度が上昇してシャフト２２が下方に移動したときに、電動ポンプ５が停止している場合は、導入通路２８の冷却水の流圧が小さくなり、第１の流入口１１から流入した冷却水の一部がバイパス通路２９、及び導入通路２８を通過してエンジン１に戻ってしまい、ヒータコア４を通過する冷却水の流量が低下して暖房効率が低下する虞がある。しかしながら、上記のように暖房時に電動ポンプ５を作動させることで、ヒータコア４を通過する冷却水の流量を十分に確保することができ、暖房効率を確保することができる。 In the present embodiment, the electric pump 5 is operated during heating of the vehicle, and the electric pump 5 is stopped during cooling of the vehicle.
In the present embodiment, the first discharge port 13 and the second inflow port 12 are always in communication with each other by the bypass passage 29. Therefore, when the cooling water temperature rises and the shaft 22 moves downward, When the pump 5 is stopped, the flow pressure of the cooling water in the introduction passage 28 decreases, and a part of the cooling water flowing in from the first inlet 11 passes through the bypass passage 29 and the introduction passage 28. Returning to the engine 1, there is a possibility that the flow rate of the cooling water passing through the heater core 4 decreases and the heating efficiency decreases. However, by operating the electric pump 5 during heating as described above, the flow rate of the cooling water passing through the heater core 4 can be sufficiently ensured, and the heating efficiency can be ensured.

一方、車両冷房時には、冷却水温度が上昇してシャフト２２が下方に移動したときに、電動ポンプ５を停止させ、導入通路２８の冷却水の流圧を低下させることで、第１の流入口１１から流入した冷却水をバイパス通路２９によってエンジン１に積極的に戻すことができるので、高温の冷却水がヒータコア４を通過することが抑制され、ヒータコア４からの熱気の発生が抑えられ、冷房性能の低下を防止することができる。   On the other hand, at the time of cooling the vehicle, when the cooling water temperature rises and the shaft 22 moves downward, the electric pump 5 is stopped, and the flow pressure of the cooling water in the introduction passage 28 is reduced, whereby the first inlet 11 can be positively returned to the engine 1 by the bypass passage 29, so that the high-temperature cooling water is suppressed from passing through the heater core 4, and the generation of hot air from the heater core 4 is suppressed. A decrease in performance can be prevented.

１ エンジン
２ 冷却水循環路
３ 電気ヒータ
４ ヒータコア
５ 電動ポンプ
１０ 切換バルブ
２０ サーモバルブ
２８ 導入通路
２９ バイパス路
３０ エンジン側循環路
３１ ヒータコア側循環路 DESCRIPTION OF SYMBOLS 1 Engine 2 Cooling water circulation path 3 Electric heater 4 Heater core 5 Electric pump 10 Switching valve 20 Thermo valve 28 Introduction path 29 Bypass path 30 Engine side circulation path 31 Heater core side circulation path

Claims (1)

エンジンとヒータコアとの間で冷却水を循環させる冷却水循環路に、冷却水を加熱する加熱手段と、冷却水循環用のポンプ及び切換バルブを備え、前記切換バルブにより前記冷却水の循環を、前記ヒータコア、前記ポンプ及び前記加熱手段の間で冷却水を循環させるヒータコア側循環路と、前記エンジンに冷却水を循環させるエンジン側循環路とに分割切換可能な車両用暖房装置であって、
前記切換バルブは、前記エンジン側循環路から流入する冷却水を、当該冷却水の温度に応じて、前記ヒータコア側循環路と前記エンジン側循環路とのいずれかに流入させるように流路を切り換えるサーモバルブと、前記サーモバルブの切換えに拘わらず、前記ヒータコア側循環路から流入する冷却水を前記エンジン側循環路へ導入する導入通路と、前記導入通路から分岐し、前記ヒータコア側循環路から流入する冷却水を前記ヒータコア側循環路に戻すバイパス路とを有し、
前記サーモバルブは、前記エンジン側循環路から流入する冷却水を、前記エンジン側循環路に流入させるように流路を切り換える際に、前記エンジン側循環路から流入する冷却水が前記ヒータコア側循環路に流入するのを遮断するように構成され、
前記切換バルブは、前記サーモバルブにより前記エンジン側循環路から流入する冷却水を、前記ヒータコア側循環路に流入させるように流路が切り換えられている場合に、前記エンジン側循環路から流入する冷却水が前記バイパス路と前記導入通路を通って、前記エンジン側循環路に戻されるように構成されていることを特徴とする車両用暖房装置。 A cooling water circulation path for circulating the cooling water between the engine and the heater core is provided with a heating means for heating the cooling water, a cooling water circulation pump and a switching valve, and the cooling water is circulated by the switching valve. A heating system for a vehicle capable of being divided and switched between a heater core side circulation path for circulating cooling water between the pump and the heating means and an engine side circulation path for circulating cooling water to the engine,
The switching valve switches the flow path so that the cooling water flowing in from the engine-side circulation path flows into either the heater core-side circulation path or the engine-side circulation path according to the temperature of the cooling water. Regardless of the switching between the thermo valve and the thermo valve, the cooling water flowing from the heater core side circulation path introduces the coolant into the engine side circulation path, branches from the introduction path, and flows from the heater core side circulation path And a bypass path for returning the cooling water to the heater core side circulation path,
When the flow path is switched so that the cooling water flowing in from the engine-side circulation path flows into the engine-side circulation path, the thermo-valve flows the cooling water flowing from the engine-side circulation path into the heater core-side circulation path It is configured to block the flow into the,
The switching valve is a cooling valve that flows from the engine side circulation path when the flow path is switched so that cooling water flowing from the engine side circulation path is caused to flow into the heater core side circulation path by the thermo valve. The vehicle heating device , wherein water is returned to the engine-side circulation path through the bypass path and the introduction path .
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